Answer:
B, C and E
Explanation:
The unit of resistance in the international system is the Ohm, the equation that describes the resistance is:
[tex]R=p\frac{l}{S} \\[/tex]
Where (l) is for lenght of the wire, (S) is the area and (p) its the constant associated to the conductor.
It's related by the Ohm's Law:
[tex]R=\frac{V}{I}[/tex]
Resistance, measured in ohms, refers to the opposition of the flow of electric charge in a conductor. It is not the excess accumulation of electric charge, nor is it measured in amps. Resistance is related to voltage and current as per Ohm's Law.
Explanation:Resistance, in the context of Physics, is the opposition to the flow of electric charge through a conductor. It can be thought of as electrical friction that resists the flow of charge, akin to how physical obstructions can slow down the flow of water. Resistance is typically measured in units called ohms and is symbolized by the Greek letter Omega (Ω). It's not the excess accumulation of electric charge, as stated in option A.
Ohm's Law, named after the German physicist Georg Simon Ohm, relates resistance to voltage and current. It states that the current passing through a conductor between two points is directly proportional to the voltage across the two points when the temperature remains constant. Mathematically, it is expressed as V = IR, where V is the voltage in volts, I is the current in amps, and R is the resistance in ohms.
Therefore, the statements B, C, and E are true about resistance. It is not measured in amps (option D); current is measured in amps. The resistance of a component can be determined using an ohmmeter, and the equivalent resistance of a circuit depends on how resistors are connected within the circuit (in series, parallel, or a combination of both).
Learn more about Resistance and Ohm's Law here:https://brainly.com/question/82424
#SPJ3
A gasoline engine operates at a temperature of 270°C and exhausts at 210°C. Calculate the maximum efficiency of this engine. (Note that the Celsius scale is used.)
89.0 %
88.0 %
12.0 %
11.0 %
Answer:
Given:
Th = 270 °C = 270+273 = 543 K, hot temperature
Tc = 210 °C = 210+273 = 363 K, cold temperature
According to the Carnot theorem, the maximum efficiency achievable by a heat engine between a hot and cold temperature is
η = 1 - Tc/Th
= 1 - 363/543
= 0.668 = 11.047 (approx)
Answer: 11.0% (nearest integer)
Answer:
Hello! the efficiency of a thermal engine depends on how much of the initial input is transformed into work, Here 270°c is the input and 210°c is the output.
Then the efficiency is calculated as e = 1 - Tc/Th, where Th is the hot temperature (in this case 270°C) and Tc is the cold temperature (in this case 210°C)
First we need to write the temperatures in kelvin degrees, this can be done by adding 273.15 to the celsius scale:
Th = 270 + 273.15 = 543.15
Tc = 210 +273.15 = 483.15
then the efficiency is e = 1 - 543.15/483.15 = 0.11
if we write this as a percentage, we get an efficiency of 11%, then the fourth answer is the correct one.
A 2.0-kg softball is pitched to you at 20 m/s. You hit the ball back along the same path, and at the same speed. If the bat was in contact with the ball for 0.10 s, what is the magnitude of the average force the bat exerted?
Answer: 800 N
Explanation:
Force is change of momentum (p) over change in time: F = ma = dp/dt
change in time dt= 0.10 s
mass = 2 kg
initial velocity v0=20 m/s
final velocity vf= -20 m/s
change in momentum dp= m(vf-v0)
dp=2(-20-20)= -80 N/s
F=dp/dt=-80/.10=-800 N
Since they only want the magnitude, you can drop the negative sign so the answer is just 800 N.
Final answer:
The magnitude of the average force exerted by the bat can be found using the impulse-momentum principle. The impulse experienced by the ball is equal to the change in momentum. The impulse is also equal to the average force multiplied by the contact time.
Explanation:
The magnitude of the average force exerted by the bat can be found using the impulse-momentum principle. The impulse experienced by the ball is equal to the change in momentum. Since the ball is initially moving along the -x direction and ends up moving along the +x direction with the same speed, the change in momentum is equal to 2 times the initial momentum. Therefore, the impulse is 2 times the initial momentum.
The impulse is also equal to the average force multiplied by the contact time. So, we can set up the equation: 2 times the initial momentum is equal to the average force multiplied by 0.10 seconds.
Solving this equation will give us the magnitude of the average force exerted by the bat.
At a maximum level of loudness, the power output of a 75 piece orchestra radiated as sound is 70.0 w. What is the intensity of these sound waves to a listener who is sitting 25.0 m from the orchestra?
Answer:
[tex]0.0089 W/m^2[/tex]
Explanation:
The intensity of a sound wave is given by
[tex]I=\frac{P}{A}[/tex]
where
P is the power of the wave at the source
A is the area over which the sound wave propagates
In this problem, we have
P = 70.0 W is the power
We want to know the intensity at a distance of r = 25.0 m from the orchestra, so since the sound waves propagates radially, we must consider a spherical surface of radius r, so the area is
[tex]A=4\pi r^2 = 4\pi (25.0 m)^2=7850 m^2[/tex]
Therefore, the intensity of the wave is
[tex]I=\frac{70 W}{7850 m^2}=0.0089 W/m^2[/tex]
What is shown in the diagram? A). A turbine B). An electromagnet C). A motor D). A generator
Answer:
I just answered a question like this. It should be B. An electromagnet :)
Explanation:
Answer:the answer is a MOTOR!
Explanation: I JUST TOOK THE K12 QUIZ
everyone on brainly is wrong! the answer is MOTOR
50 POINTS
Select all that apply.
The following diagram shows the path of a planet around the Sun. Kepler discovered that _____.
area A = area B
the distance from P 2 to P 3 is half the distance from P 5 to P 6
the speed in the interval from P 1 to P 2 is twice the speed in the interval from P 6 to P 1
the speed in the interval from P 1 to P 2 is less than the speed in the interval from P 3 to P 4
Answer:
The correct answer is: B area = area
Explanation: You can solve this problem through the use of laws of Kepler's planetary motion. There are Kepler the laws ( 3 of them) In this exercise, we will use the second law. According to this law, a line segment joining a planet and the sun sweeps out areas is equal to that during the equal intervals of time
The following diagram shows the path of a planet around the Sun. Kepler discovered that area A = area B. Option A is correct.
What is Kepler's Law ?During equal intervals of time, a line segment between a planet and the sun sweeps out regions are equal. Equal regions for equal times is Kepler's Law.
The journey of a planet around the Sun is depicted in the diagram below. Area A = area B was found by Kepler.
The regions swept away by a planet as it advances in an orbit around the Sun are equal for equal time periods. A: The equal portions of circular orbits are identical in form and size.
To learn more about the Kepler's Law refer:
https://brainly.com/question/1608361
#SPJ2
1. In a(n) ______________________ circuit, all parts are connected one after another along one path.
2. _________________________ says that resistance is equal to the voltage divided by the current.
3.In a(n) __________________________ circuit, the different parts of the circuit are on separate branches.
Answer:
1. A series circuit is a closed circuit which has all loads connected in a row and there is only one path for the current to flow.
2. The Ohm's Law state that a current flow through a resistor is directly proportional to the voltage across it [tex]R = \frac{V}{I}[/tex]
3. A parallel circuit is a closed circuit divided into branches that it has two o more paths for the current to flow and the loads are parallel to each other which mean the voltage across them is the same for all loads.
1. In an series circuit, all parts are connected one after another along one path.
2. Ohm's Law says that resistance is equal to the voltage divided by the current.
3. In an parallel circuit, the different parts of the circuit are on separate branches.
Select the correct answer from each drop-down menu.
Brass and bronze are both A.___ of copper because copper is the B.___ component in brass and bronze.
A.
alloys
composites
variations
void
B.
main
most dense
most expensive
only
Answer:
A. ) alloys
B. ) main
Explanation:
Brass and bronze are both alloys(A) of copper because copper is the main(B) component in brass and bronze.
Explanation:
Brass and Bronze are used in our day to day life known as metal alloys. Brass is an alloy of the metals like copper and zinc which has high percentage of metal copper with tin combined with it.
Brass is dull yellow in color. Bronze is reddish brown in color. Brass was known to be present in 500 BC. Bronze was about 3500 BC known to be present. Thus Bronze and Brass are both alloys of the metal copper since the main component in the brass and bronze is copper.
How much heat is absorbed by 34g iron skillet its temperature rises from 12c to 24 c ?
Answer:
[tex]1.84\cdot 10^5 J[/tex]
Explanation:
The heat absorbed by the piece of iron is given by:
[tex]Q=mC_S \Delta T[/tex]
where:
m = 34 g is the mass of the piece of iron
[tex]C_s = 450 J/g^{\circ}C[/tex] is the specific heat of iron
[tex]\Delta T=24 C-12 C=12^{\circ}C[/tex] is the variation of temperature of the piece of iron
Substituting numbers into the formula, we find
[tex]Q=(34 g)(450 J/gC)(12 C)=1.84\cdot 10^5 J[/tex]
6. How much power does it take to lift 30.0 N 10.0 m high in 5.00 s?
Answer:
60 W
Explanation:
The work done in lifting the object is given by:
[tex]W=Fd[/tex]
where
F = 30.0 N is the weight of the object
d = 10.0 m is the displacement covered by the object
Using the formula,
[tex]W=(30.0 N)(10.0 m)=300 J[/tex]
Now we can calculate the power, which is given by
[tex]P=\frac{W}{t}[/tex]
where
W = 300 J is the work done
t = 5.00 s is the time interval
Substituting,
[tex]P=\frac{300 J}{5 s}=60 W[/tex]
The power required to lift a 30.0 N weight to a height of 10.0 m in 5.00 s is calculated using the Power = Work / Time equation. The work, measured in Joules, is determined by multiplying the force (in Newtons) by the distance (in meters). This results in an output of 60.0 Watts.
Explanation:In the field of Physics, the concept of power is defined as the rate of doing work or the amount of energy transferred per unit time. In this situation, we can compute the power required to lift a 30.0 N object to a height of 10.0 m in 5.00 s using the equation: Power = Work / Time. Let us calculate:
First, we find the work done: Work = Force x Distance, so Work = 30.0 N x 10.0 m = 300.0 Joules.
Next, we calculate the power: Power = Work / Time = 300.0 Joules / 5.00 s = 60.0 Watts.
Therefore, it would take approximately 60.0 Watts of power to lift a 30.0 N object to the height of 10.0 m in 5.00 s.
Learn more about Power Calculation here:https://brainly.com/question/31734672
#SPJ3
Select all that apply. What is true about the elements of a period?
All of the elements in a period have the same number of atomic orbitals. For example, every element in the top row (the first period) has one orbital for its electrons. All of the elements in the second row (the second period) have two orbitals for their electrons.
in a series circuit what effect will adding more resistors to the circuit have
Answer:In a series circuit, adding more resistors increases total resistance and thus lowers current. But the opposite is true in a parallel circuit because adding more resistors in parallel creates more choices and lowers total resistance. If the same battery is connected to the resistors, current will increase.
Explanation:
Answer:
The correct option is "It will increase the equivalent resistance which will decrease the total current".
Explanation:Increasing resistance will always decrease total current as as resistance implies "resisting the current flow"
What type of image can a convex mirror produce?
A. a real image
B. a refracted image
C. a virtual image
It must be a virtual image, because this is the only kind of image it can produce.
What characteristics of a planet determine the strength of its gravitational force on other objects? A. diameter of the planet and its location in space B. mass of the planet and its distance from other objects C. the distance of the planet from the Earth D. the number of moons that the planet has
Answer:
mass of the planet and its distance from other objects
Explanation:
mass of the planet and its distance from other objects determine the strength of its gravitational force on other objects
The characteristics of a planet determine the strength of its gravitational force on other objects are: mass of the planet and its distance from other objects . Hence, option (B) is correct.
What is gravity?Gravity is a fundamental interaction in physics that causes all objects with mass or energy to attract one another. Gravity is by far the least powerful of the four fundamental interactions.
However, gravity is the most important interaction between things and governs the motion of planets, stars, galaxies, and even light.
Gravitational field strength of the planet can be expressed as:
E = GM/r²
Where G = universal gravitational constant and M = mass of the planet; r = distance between the planet and the object.
Hence, the characteristics of a planet determine the strength of its gravitational force on other objects are: mass of the planet and its distance from other objects .
Learn more about gravity here:
https://brainly.com/question/4014727
#SPJ6
Leap years _____.happen because the Earth revolves around the sun in less than 365 days
make up for the extra one-fourth day the Earth needs to orbit the sun
add an extra day to the end of December, making the month 32 days long
subtract a day from February, making the month only 27 days long
In the Gregorian calendar (the calendar used in most Western countries), the year begins on January 1st and ends on December 31st, lasting 365 days.
However, the Solar year (the time it takes for the Earth to make its orbit around the sun) lasts a little bit longer: 365 days 5 h 48 min 45.10 s (365.242189 days).
This means there is a gap between the Gregorian calendar and the Solar year. So, the solution given to this situation was to correct the calendar every four years by an unaccounted accumulation of approximately 1/4 of a day per year that equals one extra day, as follows:
"Leap year is divisible by 4, unless it is a secular year (last of each century, ending in 00), in which case it must also be divisible by 400."
This extra day is added in February, after day 28th. That is why every four years we have a February 29th in the Gregorian calendars or a Leap year.
Answer:
Leap years make up for the extra one-fourth day the Earth needs to orbit the sun
Explanation:
An engineer is working on a new kind of wire product that is about the size of a bacterium cell. Which kind of technology is the engineer using?
nanotechnology
microtechnology
atomic technology
cellular technology
Microtechnology i hope this will help
Answer: Second option is correct.
Explanation:
An engineer is working on a new kind of wire product that is about the size of a bacterium cell, this kind of technology is known as "Micro technology".
It deals with features near one micrometer.
It is used to create structure having functional feature with at least one dimension.
Hence, Second option is correct.
The weapon used by the Jawa surrounds R2-D2 with a strong electric field, which is created by a large imbalance of _____.
electrons
chemical bonds
neutrons
the Force
Answer:
Electrons
Explanation
Only charged particles like protons and electrons can create an electric field. Around every proton and electron there is an electric field. Since electric field is proportional to the magnitude of charge, large number of charges will produce a large field.
The large imbalance electron would create a significant electric field
Note: imbalance of electrons would mean that, there are more ( or less) number of electrons present than there are protons
Final answer:
The weapon used by the Jawa creates an electric field through an imbalance of electrons. In an atomic nucleus, protons stay together thanks to the strong nuclear force, which is much stronger than the electromagnetic repulsion between positively charged protons.
Explanation:
The weapon used by the Jawa surrounds R2-D2 with a strong electric field, which is created by a large imbalance of electrons. An electric field is produced when there is an excess or deficit of electrons, which are negatively charged particles. This imbalance generates a force, pushing on other electric charges within the field, and this is what captures R2-D2 in the Star Wars universe.
An atomic nucleus is able to stay intact, not flying apart despite the repulsion between positively charged protons, because of the strong nuclear force. This force is significantly stronger than the electromagnetic force and is responsible for holding the protons and neutrons together in the nucleus of an atom. On the other hand, the weak nuclear force is much weaker and has only a marginal effect in offsetting the electric force between protons.
Which item(s) would be sufficient to make a circuit? A. conductor B. insulator C. conductor and battery D. insulator and battery E. battery
Answer:
C. conductor and battery
Explanation:
An electrical circuit is the part in which two or more conductors are joined in series , parallel or in mixed grouping such that when they are connected to a battery then some current will flow through it.
So here we can say that in order to make a complete circuit we need to take care that current will flow through the combination which will make a circuit
In order to flow the current we need an energy source which is done by the battery and other is the conductor which help to flow the the charge particles.
So here correct answer will be
C. conductor and battery
Answer:
A conductor and a battery
Explanation:
Group 18 noble gases are inert because
a. they readily form positive ions.
b. they can have either a positive or a negative charge.
c. their outermost energy level is missing one electron.
d. their outermost energy level is full.
Final answer:
Group 18 noble gases, including helium, neon, and argon, are inert due to their full outermost energy levels, making them chemically stable and minimally reactive under normal conditions.
Explanation:
Group 18 noble gases are inert because d. their outermost energy level is full.
The noble gases, such as helium, neon, and argon, possess filled outer electron shells, making them extremely stable. This configuration, often known as a filled valence shell or octet, imparts a large ionization energy to these elements, making them reluctant to lose an electron. In the event that they do accept an additional electron, it would occupy a much higher energy level, rendering it loosely bound and thus energetically unfavorable. The inherent stability of their electron configurations means that noble gases are chemically inert, demonstrating minimal reactivity under normal conditions. Under extreme conditions, such as high pressure and temperature, they can be coerced into forming chemical compounds, though this is not typical of their standard chemical behavior.
A bulldozer does 4,500 J of work to push a mound of soil to the top of a ramp that is 15 m high. The ramp is at an
angle of 35° to the ground. How much force did the bulldozer apply to the mound of soil? Round your answer to two
significant figures.
Answer:
170 N
Explanation:
Given in the question that, work a bulldozer can do = 4500 J
Step 1We will use trigonometry identity to find the distance bulldozer will travel up the hill
sin(35) = opp/hypo
sin(35) = 15/hypo
hypo = 15/sin(35)
hypo = 26.15m
Step 2Formula to use
work done = force × distance
Plug values in the above formula
4500 = force x 26.15
force = 4500/26.15
force = 172.08
force ≈ 170 N
Answer:
520 N
Explanation:
Ohm’s law is represented by the equation I = V/R. Explain how the current would change if the amount of resistance decreased and the voltage stayed the same.
Answer:
The current is proportional to the voltage and inversely proportional to the resistance. This mean if the resistance decreased and the voltage stayed constant, the current will increase.
Explanation:
Let's star with a closed circuit with a constant voltage of 48V, and a variable resistor selector of 6, 4 and 2 Ohms.
Using Ohm's Law equation [tex]I=\frac{V}{R}[/tex]
With the variable resistor selector on 6 Ohms
[tex]I=\frac{48V}{6ohms} =8A[/tex]
Changing the selector to a 4 Ohms
[tex]I=\frac{48V}{4ohms} = 12A[/tex]
Last, changing the selector to a 2 Ohms
[tex]I=\frac{48V}{2ohms} =24A[/tex]
malcom is doing a wheely on his motorcycle and moving at 20 m/s with a momentum of 6000 kg m/s when he lays her down. The mass of the motorcycle is 190 kg. What is the mass of Malcom?
Answer:
110 kg
Explanation:
The momentum of the Malcom+motorcycle system is given by:
[tex]p=(m+M)v[/tex]
where
(m+M) is the total mass of the system, with
m = mass of Malcom
M = 190 kg (mass of the motorcycle)
v = 20 m/s velocity
Since we know the momentum:
p = 6000 kg m/s
We can re-arrange the equation to find the mass of Malcom:
[tex]m=\frac{p}{v}-M=\frac{6000 kg m/s}{20 m/s}-190 kg=110 kg[/tex]
Naoki's bicycle has a mass of 11 kg. If Naoki sits on her bicycle and starts pedaling with a force of 110.5 N, causing an acceleration of 1.7 m/s2, what is Naoki's mass?
Naoki's mass is calculated to be 54 kg by using Newton's second law of motion and subtracting the bicycle's mass from the total mass obtained when the force and acceleration are considered.
To determine Naoki's mass given that her bicycle has a mass of 11 kg and she accelerates it with a force of 110.5 N at an acceleration of 1.7 m/s², we can use Newton's second law of motion, which states that force equals mass times acceleration (F = m * a). Here, the total mass includes both Naoki's mass and the bicycle's mass.
First, we calculate the total mass by rearranging the equation to m = F / a. Substituting in the known values, we get m = 110.5 N / 1.7 m/s², which gives us a total mass of 65 kg. Since we know the bicycle's mass is 11 kg, we subtract this from the total mass to find Naoki's mass: 65 kg - 11 kg = 54 kg. Therefore, Naoki's mass is 54 kg.
Which statements describe the energy in a food web? Check all that apply. When an organism eats another organism, it loses energy. Producers have the greatest amount of available energy. Energy can follow many different paths. When an organism eats another organism, it gains energy. Producers have the least amount of available energy. Energy always follows a single path.
Answer: Producers have the greatest amount of available energy.
When an organism eats another organism, it gains energy.
Explanation:
A food chain is a linear sequence of transfer of food and energy when one organism is eaten by the other organism. A food web is the interconnection of two or more food chains. This happens when one organism belong to one food chain also consume organisms of same food chain or other food chain. A food chain includes trophic levels on the basis of the mode of feeding of the living beings.
Among the options given, Producers have the greatest amount of available energy. and
When an organism eats another organism, it gains energy. are correct.
Producers are the organism which are capable of producing their food either through photosynthesis or chemosynthesis. They are present at the base level of the food chain. They consist of large amount of energy as compared to all the trophic levels in the food chain.
When one organism eats other organism it gains energy because of the assimilation and digestion of the organism as food.
Which expression is equal to the number of grams (g) in 2.43 kilograms (kg)?
A. 2.43 kg x 1000 g/1 kg
B. 2.43 g x 1 kg/1000 g
C. 1/2.43 kg x 1000 g/1 kg
1/2.43 kg x 1 kg/1000 g
Answer:
A. 2.43 kg x 1000 g/1 kg
Explanation:
We know that the equivalence between grams and kilograms is
[tex]1 kg = 1000 g[/tex]
So, if we want to convert a mass m from kg to g, we just need to multiply the value by the factor [tex]\frac{1000 g}{1 kg}[/tex].
In this problem, the mass is
m = 2.43 kg
Therefore, multiplying by the factor above, we get
[tex]m = 2.43 kg \cdot \frac{ 1000 g}{1 kg}[/tex]
Answer:
A
Explanation:
edge 2020
Find the gravitational potential at a point on the earth surface. Take mass as of earth as 5.98×10^24kg,it's radius as6.38×10^6nand G=6.67×10^-11Nm^2kg^-2
Answer:
[tex]-6.25\cdot 10^7 J[/tex]
Explanation:
The gravitational potential at a point on the Earth surface is given by:
[tex]U=-\frac{GM}{R^2}[/tex]
where
G=6.67×10^-11Nm^2kg^-2 is the gravitational constant
M=5.98×10^24kg is the Earth's mass
R=6.38×10^6 m is the Earth's radius
Substituting the numbers into the equation, we find
[tex]U=-\frac{(6.67\cdot 10^{-11})(5.98\cdot 10^{24})}{(6.38\cdot 10^6)}=-6.25\cdot 10^7 J[/tex]
If the gauge pressure of a gas is 114 kPa, what is the absolute pressure?
A. 220 kPa
B. 14 kPa
C. 50 kPa
D. 214 kPa
Answer:
D. 214 kPa
Explanation:
The absolute pressure is given by:
[tex]p = p_a + p_g[/tex]
where
p is the absolute pressure
[tex]p_a \sim 100 kPa[/tex] is the atmospheric pressure
[tex]p_g[/tex] is the gauge pressure
In this problem, we have
[tex]p_g = 114 kPa[/tex]
So, the atmospheric pressure is
[tex]p = 100 kPa + 114 kPa = 214 kPa[/tex]
Answer:
your answer is 214kPa
Explanation:
1. The diver has the least gravitational potential energy at which position? (15 points)
Position 4
At position 4 the diver has the least amount of height, which is what GPE is proportional to.
Hope this helped!
Taphonomy is the study of what happens to animals or humans between the time that they die and the time that their remains are found.
Answer:
True.
Explanation:
The formation of fossils is associated with a series of biological and geological events beginning with the death of an organism. This is followed by a series of events, such as necrolysis, disarticulation, transport and burial of the remains, until the final occurrence of the physicochemical processes that transform sediments into rock and fossilize the organisms deposited therein. The area of paleontology that deals with unraveling all the processes mentioned above is taphonomy. With that we can say yes, Taphonomy is the study of what happens to animals or humans between the time they die and the time their remains are found.
Power in a light bulb is voltage times current. A 10 ohm light bulb is connected to a 12 v battery. What is the power of the light bulb? *
120 W
12.2 W
10 W
1.2 W
0.83 W
14.4 W
Answer:
=14.4Watts
Explanation:
Power in a light bulb is calculated by the use of the following formula: P=VI
For the provided scenario, the current will be calculated as follows:
I=V/R
=12V/10Ω
=1.2A
Therefore P=12V×1.2A
=14.4Watts
If a 25 kg object is moving at a velocity of 5 m/s, the object has —— energy.
Any object that's moving has kinetic energy.
Its kinetic energy is (1/2)·(its mass)·(its speed squared) Joules.